You may have to open your mouth pretty wide to take a bite of a burger, but a Hydra can tear open its mouth to devour food larger than itself.
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Sources
Mouth:
https://www.cell.com/biophysj/fulltext/S0006-3495(16)00052-7#secsectitle0015
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4833776/
https://www.csmonitor.com/Science/2016/0309/Real-life-hydra-creates-a-new-mouth-for-every-meal
Body size:
https://pubmed.ncbi.nlm.nih.gov/599169/
https://cob.silverchair-cdn.com/cob/content_public/journal/jcs/28/1/10.1242_jcs.28.1.117/1/117.pdf?Expires=1639604936&Signature=26~4bxcW2-wGSFUR~x76p4~sXR1CNmLxADiZDeXM2o8CBaVI3ISzoHnLVodV7Y4YjIhbPGK5M8q0dxGJXEgl4yeQBy8GTuNWmqopImdF1ebjOEXLFH8M5PtgnlzERu2xz37vPe0LjqBDBd8eg7hE6ttk7hlZuu~S3zcVwSl7~wIPmj1h2zrHdDu9g97wudTEUevZsPmL-Yt8dcGMoEHpbPzdBto98FvHMzPzakxARqs0v93mk9F-bzGhs5QYQ8adZxP4mbbkvkvVL5vYglR67WE4Tc-EyQg6b6Wkh5XkbpBa2JddSOCYs97~4K92jdtNzaEYuL3DPjeajelVwUEUBQ__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA
http://www.researchtrends.net/tia/article_pdf.asp?in=0&vn=10&tid=49&aid=6022
https://www.jstor.org/stable/1467128?read-now=1&refreqid=excelsior2b3e2370fa7735f8491eaa0653f7bef9&seq=3#page_scan_tab_contents
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4985254/
https://www.researchgate.net/publication/285274778_Response_of_green_hydra_Hydra_viridissima_to_variability_and_directional_changes_in_food_availability
Brain:
https://journals.biologists.com/dev/article/124/2/569/39586/Pattern-of-differentiated-nerve-cells-in-hydra-is
https://www.jneurosci.org/content/jneuro/11/7/2011.full.pdf
https://www.sciencefocus.com/news/secret-of-the-immortal-hydras-regenerating-ability-uncovered/
https://www.science.org/doi/10.1126/science.aav9314
https://elifesciences.org/articles/64108
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5423359/
https://www.frontiersin.org/10.3389/conf.neuro.10.2009.14.057/event_abstract
#SciShow
https://www.istockphoto.com/photo/young-man-eating-cheese-burger-gm1329471875-413187824
https://www.storyblocks.com/video/stock/an-extreme-close-up-of-the-human-eye-with-the-iris-increasing-and-decreasing-in-size-seamless-looping-rwc601um_klnx6t0v
https://commons.wikimedia.org/wiki/File:Hydra_biology.jpg
https://www.istockphoto.com/photo/freshwater-polyp-ssswasser-polyp-gm1255602216-367379339
https://www.istockphoto.com/photo/hydra-vulgaris-freshwater-hydroid-gm177320934-20139861
https://www.istockphoto.com/photo/lymph-node-with-metastatic-colonic-adenocarcinoma-h-e-stain-gm513128494-87477779
https://www.istockphoto.com/photo/hydra-vulgaris-gm166109978-23646488
https://www.istockphoto.com/photo/portrait-young-confident-smart-asian-businessman-look-at-camera-and-smile-gm1288538088-384463311
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